Introduce ReactorNettyClientRequestFactory

This commit introduces an implementation of ClientHttpRequestFactory
based on Reactor Netty's HttpClient.

Closes gh-30835

spring-web/src/test/java/org/springframework/http/client/ReactorNettyClientHttpRequestFactoryTests.java

@@ -0,0 +1,40 @@
+/*
+ * Copyright 2023-2023 the original author or authors.
+ *
+ * Licensed under the Apache License, Version 2.0 (the "License");
+ * you may not use this file except in compliance with the License.
+ * You may obtain a copy of the License at
+ *
+ *      https://www.apache.org/licenses/LICENSE-2.0
+ *
+ * Unless required by applicable law or agreed to in writing, software
+ * distributed under the License is distributed on an "AS IS" BASIS,
+ * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
+ * See the License for the specific language governing permissions and
+ * limitations under the License.
+ */
+
+package org.springframework.http.client;
+
+import org.junit.jupiter.api.Test;
+
+import org.springframework.http.HttpMethod;
+
+/**
+ * @author Arjen Poutsma
+ */
+public class ReactorNettyClientHttpRequestFactoryTests extends AbstractHttpRequestFactoryTests {
+
+	@Override
+	protected ClientHttpRequestFactory createRequestFactory() {
+		return new ReactorNettyClientRequestFactory();
+	}
+
+	@Override
+	@Test
+	public void httpMethods() throws Exception {
+		super.httpMethods();
+		assertHttpMethod("patch", HttpMethod.PATCH);
+	}
+
+}

spring-web/src/test/java/org/springframework/web/client/RestClientIntegrationTests.java

@@ -48,6 +48,7 @@ import org.springframework.http.client.HttpComponentsClientHttpRequestFactory;
 import org.springframework.http.client.JdkClientHttpRequestFactory;
 import org.springframework.http.client.JettyClientHttpRequestFactory;
 import org.springframework.http.client.OkHttp3ClientHttpRequestFactory;
+import org.springframework.http.client.ReactorNettyClientRequestFactory;
 import org.springframework.http.client.SimpleClientHttpRequestFactory;
 import org.springframework.util.CollectionUtils;
 import org.springframework.web.testfixture.xml.Pojo;
@@ -77,7 +78,8 @@ class RestClientIntegrationTests {
 			named("HttpComponents", new HttpComponentsClientHttpRequestFactory()),
 			named("OkHttp", new OkHttp3ClientHttpRequestFactory()),
 			named("Jetty", new JettyClientHttpRequestFactory()),
-			named("JDK HttpClient", new JdkClientHttpRequestFactory())
+			named("JDK HttpClient", new JdkClientHttpRequestFactory()),
+			named("Reactor Netty", new ReactorNettyClientRequestFactory())
 		);
 	}
 

spring-web/src/test/java/org/springframework/web/client/RestTemplateIntegrationTests.java

@@ -51,6 +51,7 @@ import org.springframework.http.client.HttpComponentsClientHttpRequestFactory;
 import org.springframework.http.client.JdkClientHttpRequestFactory;
 import org.springframework.http.client.JettyClientHttpRequestFactory;
 import org.springframework.http.client.OkHttp3ClientHttpRequestFactory;
+import org.springframework.http.client.ReactorNettyClientRequestFactory;
 import org.springframework.http.client.SimpleClientHttpRequestFactory;
 import org.springframework.http.converter.FormHttpMessageConverter;
 import org.springframework.http.converter.json.MappingJacksonValue;
@@ -96,7 +97,8 @@ class RestTemplateIntegrationTests extends AbstractMockWebServerTests {
 			named("HttpComponents", new HttpComponentsClientHttpRequestFactory()),
 			named("OkHttp", new OkHttp3ClientHttpRequestFactory()),
 			named("Jetty", new JettyClientHttpRequestFactory()),
-			named("JDK HttpClient", new JdkClientHttpRequestFactory())
+			named("JDK HttpClient", new JdkClientHttpRequestFactory()),
+			named("Reactor Netty", new ReactorNettyClientRequestFactory())
 		);
 	}